<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/licenses/publicdomain/
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg"
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      a:visited > rect  { fill: red;  }
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  <!-- Note: the <a> element below links to _this document_, so it'll
       normally be treated as visited. However, in an image context, we want to
       ignore visitedness. -->
  <a xlink:href="" id="foo">
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</svg>
